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kube-netc: A Kubernetes eBPF network monitor

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kube-netc (pronounced kube-net-see) is a Kubernetes network monitor built using eBPF

Getting Started

To test the current capabilities of kube-netc, this guide will walk you through viewing the network statistics of your nodes.

Install kube-netc

First, install the daemon set using the install.yaml:

kubectl apply -f https://github.com/nirmata/kube-netc/raw/master/config/install.yaml

View results

This will start the kube-netc DaemonSet on your cluster and setup the required roles. Then, we get the name of the kube-netc pod:

kubectl get pods --all-namespaces | grep kube-netc

For example, my kube-netc pod is:

kube-netc-j56cx

In a new terminal, we port-forward the port of our pod so we can access it with curl outside the cluster with:

kubectl port-forward kube-netc-j56cx 9655:9655

9655 is the port we are going to access the Prometheus endpoint on. We can then curl the /metrics endpoint using curl on local host to show the Prometheus metrics:

curl localhost:9655/metrics | grep bytes_recv{

This is an example output of the query showing the total bytes received by this node from each given connection:

...
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:1640",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 2960
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:38256",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 295276
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:38258",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 178
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:38446",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 276120
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:38448",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 39315
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:38460",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 122540
bytes_recv{component="kube-controller-manager",destination_address="172.18.0.2:38496",destination_kind="pod",destination_name="kube-controller-manager-drewcluster-control-plane",destination_namespace="kube-system",destination_node="drewcluster-control-plane",instance="",managed_by="",name="",part_of="",source_address="172.18.0.2",source_kind="pod",source_name="kube-controller-manager-drewcluster-control-plane",source_namespace="kube-system",source_node="drewcluster-control-plane",version=""} 3382
...

As we see the bytes received by each connection is shown and the source IP is given. If there is a known pod, node or service with the same IP, the source_name and or destination_name is also given.

Grafana Demo

There is a pre-prepared Grafana dashboard so you can test out kube-netc yourself and visualize the reported stats.

Grafana Dashboard

Make sure to point Prometheus to the kube-netc exporter in your configuration by appending a new job to your scrape_configs in your prometheus.yml:

- job_name: 'kube-netc' 
    static_configs: 
    - targets: ['localhost:9655']

Then you can start Prometheus and import the dashboard into Grafana.

Design

Please see the DESIGN for information on how kube-netc is structured.

Thanks

Special thanks to Alban from Kinvolk for his assistance with implementing eBPF and DataDog for their eBPF library.


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